Help reinstalling webhook

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Before I begin I would like to say that I'm not a developer. Some programming knowledge but I've never had to deal with the Shopify API before. 

I had a developer create an app for my shopify store, and one year later I have a problem where the new orders are not updating to the app. In the handover documents it says we need to reinstall webhook using this command.

curl -sL -XPOST https://(developersdomain):5566/fab/webhook -d "shopDomain=(shopdomain)"

(developersdomain) and (shopdomain) will be substituted with actual urls naturally.

My question is - Where and how do I execute this command? The only webhooks I can find is under Settings -> Notifications. 

Thank you!